big gun,
I got a chance to mic the trunion. not good. .907" the barrel mic's out at .9055". now Im not sure it would work with a rommy barrel. the more I think on this one the more Im thinking of a milled .308 ak. this would keep me from digging out and swaping to the 5.56 guide in a milled reciver. I might be able to sleve my pistol barrel and get it to work, if I ever find the barrel. muttman

The Chinese 5.56 AK barrels are about 19mm at the chamber end. That should be a safe diameter but doesn't leave a lot of room for much of a sleeve. I built a 9mm AK using an Uzi barrel. I was trying to figure out how to sleeve it and not have the sleeve move while pressing the barrel. What I did was thread the barrel and sleeve. I wouldn't want to reduce the barrel diameter much on the chamber end of a 5.56.

threaded sleeve. Im thinking of a 1/8" dowl pin on the sleve to barrel then turn down to proper o.d. , but turning a sleave would work better then than what I was planning. Ill be working on a sleeve tonight.
muttman

got the sleve (4130) made, drilled and taped 7/8x14 the o.d. is just over 1" that will get cut down after it is on the barrel. Im planning on using some loctite 660 quick metal on the threads to get a 100% fill in the threads and lock it in. I dont think the sleeve will move after it sets up. I had thought of leaving a "ring" to leep the sleve in place but that would require me to cut the breach to the taper. now I only need to cut the part that is used in the trunion keeping the look of the unmoded barrel. muttman